Homogeneous and silica-supported azidoproazaphosphatranes as efficient catalysts for the synthesis of substituted coumarins

Homogeneous and silica-supported azidoproazaphosphatranes derived from the Verkade's superbase catalyze the synthesis of substituted coumarins with moderate to good yields and high selectivity.

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► Examine the catalytic behavior of azidoproazaphosphatranes in the Knoevenagel condensation.
► Preparation of superbase functionalized mesoporous SBA-15 catalysts.
► Azidoproazaphosphatranes immobilized onto SBA-15 silica are efficient for the synthesis of coumarins.
► Molecular and supported azidoproazaphosphatrane catalysts are compared.